# gcr_integration.jl
# Integration with GCR.jl framework for NSEMSolver

"""
    GCRNSSolver <: NSLinearSolver

GCR-based linear solver for Navier-Stokes systems.
"""
struct GCRNSSolver <: NSLinearSolver
    # Placeholder for GCR solver configuration
end

"""
    create_gcr_solver(options::NSOptions) -> GCRNSSolver

Create a GCR-based linear solver for Navier-Stokes systems.
"""
function create_gcr_solver(options::NSOptions)
    if !HAS_GCR
        error("GCR.jl not available. Please install GCR.jl or use a different solver.")
    end
    
    @warn "GCR solver integration not fully implemented yet"
    return GCRNSSolver()
end

"""
    solve_ns_system!(x::Vector, A::AbstractMatrix, b::Vector, solver::GCRNSSolver) -> Bool

Solve the Navier-Stokes linear system using GCR methods.
"""
function solve_ns_system!(x::Vector, A::AbstractMatrix, b::Vector, solver::GCRNSSolver)
    if !HAS_GCR
        error("GCR.jl not available")
    end
    
    @warn "GCR system solve not fully implemented yet"
    # Fallback to standard solver for now
    try
        x[:] = A \ b
        return true
    catch
        return false
    end
end